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Collective behavior has been observed in high-energy heavy-ion collisions forseveral decades. Collectivity is driven by the high particle multiplicitiesthat are produced in these collisions. At the Large Hadron Collider (LHC),features of collectivity have also been seen in high-multiplicity proton-protoncollisions that can attain particle multiplicities comparable to peripheralPb-Pb collisions. One of the possible signatures of collective behavior is thedecrease of femtoscopic radii extracted from pion and kaon pairs emitted fromhigh-multiplicity collisions with increasing pair transverse momentum. Thisdecrease can be described in terms of an approximate transverse mass scaling.In the present work, femtoscopic analyses are carried out by the ALICEcollaboration on charged pion and kaon pairs produced in pp collisions at$\sqrt{s}=13$ TeV from the LHC to study possible collectivity in pp collisions.The event-shape analysis method based on transverse sphericity is used toselect for spherical versus jet-like events, and the effects of this selectionon the femtoscopic radii for both charged pion and kaon pairs are studied. Thisis the first time this selection method has been applied to charged kaon pairs.An approximate transverse-mass scaling of the radii is found in allmultiplicity ranges studied when the difference in the Lorentz boost for pionsand kaons is taken into account. This observation does not support thehypothesis of collective expansion of hot and dense matter that should onlyoccur in high-multiplicity events. A possible alternate explanation of thepresent results is based on a scenario of common emission conditions for pionsand kaons in pp collisions for the multiplicity ranges studied.

Femtoscopic correlations of identical charged pions and kaons in pp collisions at $\sqrt{s}=13$ TeV with event-shape selection